khalat vs surgical gown

khalat

noun
  • A type of native gown worn in parts of Central Asia, historically awarded as a robe of honor. 

  • A long, close-fitting coat with shawl collars and pockets, worn by Ashkenazi Jewish men in Eastern Europe until the early 20th century 

surgical gown

noun
  • A protective plastic gown worn by a surgeon when performing surgery. 

How often have the words khalat and surgical gown occurred in a corpus of books? (source: Google Ngram Viewer )